Default Default Default One Question Per Page false false Earth Hour takes place _____ every year. 2 in October in the same month on the same day Earth Hour started in _____. 3 Paris San Francisco Sydney It was celebrated around the world for the first time in _____. 2 2007 2008 2012 In 2008, _____ countries took part in the event. 1 35 400 7,000 The Earth Hour movement is _____ a one-hour event. 1 more than only part of The _____ is the organisation that introduced the idea for Earth Hour. 3 United Nations World Health Organization World Wide Fund for Nature https://339efcb25eb75e967b0d-ff8eeadd950d51fd1fc939dca75b3973.ssl.cf1.rackcdn.com/assets_default.swf